hongjr03
b9f50407be
我之前判断错了——OpenRouter 有 Anthropic Messages API 兼容端点 (https://openrouter.ai/api),Claude Code SDK 直连不需要代理。 ANTHROPIC_AUTH_TOKEN=OpenRouter key,ANTHROPIC_API_KEY='' 即可。 而且 ANTHROPIC_DEFAULT_SONNET_MODEL 可设 OpenRouter model ID (z-ai/glm-4.7 等),所以 provider-agnostic 没丢。 ADR-0017 重写:从'Anthropic 专有'改为'Claude Code SDK via OpenRouter, 保留 provider-agnostic'。tsc rc=0。
2.5 KiB
ADR 0017: Agent Runtime — Claude Code SDK via OpenRouter
Status
Accepted.
Context
The original ADR-0017 mandated a provider-agnostic agent layer: any
OpenAI-compatible model via OpenRouter, custom agent loop built on Vercel AI
SDK's streamText. The motivation was to avoid vendor lock-in.
In practice, the hand-rolled agent loop lacked capabilities that a production agent needs: context compaction (long conversations), tool approval flows, partial-message streaming, and a battle-tested multi-turn loop. Building these ourselves meant re-implementing what the Claude Code SDK already provides.
The Feishu integration also proved costly to hand-roll — card schema quirks, patch limitations, file support — each API quirk cost a round-trip.
Decision
Adopt @anthropic-ai/claude-agent-sdk as the agent runtime, routed through
OpenRouter's "Anthropic Skin" (https://openrouter.ai/api).
OpenRouter exposes an Anthropic Messages API-compatible endpoint. Claude Code
SDK speaks its native protocol directly to OpenRouter — no proxy, no format
conversion. The SDK's query() owns the agent loop (tool dispatch, compaction,
streaming). Built-in tools (Read, Write, Bash, Glob, Grep) cover the entire
tool surface — no custom tools needed. cph check / cph build run via Bash.
Environment variables:
ANTHROPIC_BASE_URL=https://openrouter.ai/api
ANTHROPIC_AUTH_TOKEN=<OpenRouter API key>
ANTHROPIC_API_KEY="" # must be explicitly empty
Model routing: ANTHROPIC_DEFAULT_SONNET_MODEL etc. accept OpenRouter model
IDs (e.g. z-ai/glm-4.7, anthropic/claude-sonnet-4-20250514). This means
provider-agnosticism is preserved — any OpenRouter model that supports tool
use can be used, not just Anthropic models.
Consequences
- Provider-agnosticism preserved via OpenRouter — GLM, Claude, GPT, etc. all work as long as the model supports tool use.
- The agent loop is Claude Code SDK's (compaction, tool approval, partial message streaming) — not hand-rolled.
- Custom tools (read_file, write_file, cph_check, cph_build) are replaced by the SDK's built-in Read/Write/Bash/Glob/Grep.
- The SSE event format matches Claude-to-IM's expected protocol natively.
- Per-run model selection works via role→model mapping; models are OpenRouter IDs, not Anthropic-only aliases.
- OpenRouter recommends setting Anthropic as the top-priority provider for Claude Code; non-Anthropic models may have reduced compatibility with some SDK features (e.g. thinking blocks).